<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" href="./css/inputnumber.css" />
    <link rel="stylesheet" href="./css/index.css" />
    <title>购物车</title>
  </head>
  <body>
    <div class="app-container" id="app">
      <!-- 顶部banner -->
      <div class="banner-box">
        <img src="http://autumnfish.cn/static/fruit.jpg" alt="" />
      </div>
      <!-- 面包屑 -->
      <div class="breadcrumb">
        <span>🏠</span>
        /
        <span>购物车</span>
      </div>
      <!-- 购物车主体 -->
      <div class="main" v-if="fruitList.length>0">
        <div class="table">
          <!-- 头部 -->
          <div class="thead">
            <div class="tr">
              <div class="th">选中</div>
              <div class="th th-pic">图片</div>
              <div class="th">单价</div>
              <div class="th num-th">个数</div>
              <div class="th">小计</div>
              <div class="th">操作</div>
            </div>
          </div>
          <!-- 身体 -->
          <div v-for="(item,index) in fruitList" class="tbody" :key="item.id">
            <div class="tr" :class="{active:item.isChecked}">
              <div class="td">
                <input type="checkbox" v-model="item.isChecked" />
              </div>
              <div class="td">
                <img src="./img/火龙果.png" alt="" />
              </div>
              <div class="td">{{item.price}}</div>
              <div class="td">
                <div class="my-input-number">
                  <button
                    :disabled="item.num==0"
                    @click="deca(item.id)"
                    class="decrease"
                  >
                    -
                  </button>
                  <span class="my-input__inner">{{item.num}}</span>
                  <button @click="dece(item.id)" class="increase">+</button>
                </div>
              </div>
              <div class="td">{{item.num*item.price}}</div>
              <div @click="del(item.id)" class="td"><button>删除</button></div>
            </div>
          </div>
        </div>
        <!-- 底部 -->
        <div class="bottom">
          <!-- 全选 -->
          <label class="check-all">
            <input v-model="all" type="checkbox" />
            全选
          </label>
          <div class="right-box">
            <!-- 所有商品总价 -->
            <span class="price-box"
              >总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price"
                >{{zongjia}}</span
              ></span
            >
            <!-- 结算按钮 -->
            <button class="pay">结算{{jiesuan}}</button>
          </div>
        </div>
      </div>
      <!-- 空车 -->
      <div v-else="fruitList.length==0" class="empty">🛒空空如也</div>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script>
      const defaultList = [
        {
          id: 1,
          icon: "http://autumnfish.cn/static/火龙果.png",
          isChecked: true,
          num: 2,
          price: 6,
        },
        {
          id: 2,
          icon: "http://autumnfish.cn/static/荔枝.png",
          isChecked: false,
          num: 7,
          price: 20,
        },
        {
          id: 3,
          icon: "http://autumnfish.cn/static/榴莲.png",
          isChecked: false,
          num: 3,
          price: 40,
        },
        {
          id: 4,
          icon: "http://autumnfish.cn/static/鸭梨.png",
          isChecked: true,
          num: 10,
          price: 3,
        },
        {
          id: 5,
          icon: "http://autumnfish.cn/static/樱桃.png",
          isChecked: false,
          num: 20,
          price: 34,
        },
      ];
      const app = new Vue({
        el: "#app",
        data: {
          anniu: 1,
          //优先读取本地存储
          fruitList:
            JSON.parse(localStorage.getItem("fruitList")) || defaultList,
          // 水果列表
          fruitList: [
            {
              id: 1,
              icon: "http://autumnfish.cn/static/火龙果.png",
              isChecked: true,
              num: 2,
              price: 6,
            },
            {
              id: 2,
              icon: "http://autumnfish.cn/static/荔枝.png",
              isChecked: false,
              num: 7,
              price: 20,
            },
            {
              id: 3,
              icon: "http://autumnfish.cn/static/榴莲.png",
              isChecked: false,
              num: 3,
              price: 40,
            },
            {
              id: 4,
              icon: "http://autumnfish.cn/static/鸭梨.png",
              isChecked: true,
              num: 10,
              price: 3,
            },
            {
              id: 5,
              icon: "http://autumnfish.cn/static/樱桃.png",
              isChecked: false,
              num: 20,
              price: 34,
            },
          ],
        },
        methods: {
          del(id) {
            this.fruitList = this.fruitList.filter((item) => item.id != id);
          },
          deca(id) {
            const jian = this.fruitList.find((item) => item.id == id);
            jian.num--;
          },
          dece(id) {
            const jia = this.fruitList.find((item) => item.id == id);
            jia.num++;
          },
        },
        computed: {
          all: {
            get() {
              return this.fruitList.every((item) => item.isChecked);
            },
            set(value) {
              this.fruitList.forEach((item) => (item.isChecked = value));
            },
          },
          // checkedList() {
          //   return this.fruitList.filter((item) => item.isChecked);
          // },
          jiesuan() {
            return this.fruitList.reduce((sum, item) => {
              if (item.isChecked) {
                return sum + item.num;
              } else {
                return sum;
              }
            }, 0);
            // return this.checkedList.reduce((sum, item) => {
            //   sum + item.num;
            // }, 0);
          },
          zongjia() {
            return this.fruitList.reduce((sum, item) => {
              if (item.isChecked) {
                return sum + item.num * item.price;
              } else {
                return sum;
              }
            }, 0);
            // return this.checkedList.reduce((sum, item) => {
            //   sum + item.num * item.price;
            // }, 0);
          },
          watch: {
            fruitList: {
              handler() {
                localStorage.setItem(
                  "fruitList",
                  JSON.stringify(this.fruitList)
                );
              },
              deep: true,
            },
          },
        },
      });
    </script>
  </body>
</html>
